ASoC: SOF: sof-client-probes-ipc4: Human readable debugfs "probe_points"

The current output of three integers is not very human readable. Use
ipc4 functions to describe in more detail what the struct
sof_probe_point_desc buffer_id is actually referring to in an ipc4 SOF
system.

Before this commit the "probe_points" debugfs file could read as:

Id: 0x01000004  Purpose: 0  Node id: 0x100
Id: 0x00000006  Purpose: 0  Node id: 0x100

And after in the same situation in an ipc4 system it reads:

0x7,0x0,0x100   gain.1.1 input buf idx 0 (connected)
0x1000005,0x0,0x100     host-copier.0.playback output buf idx 0 (connected)

The triplet in the beginning of the line can be used to reinserted the
probe point again by writing it into "probe_points" debugfs file, if
its first removed by writing the fist number in "probe_points_remove".
The last number is ignored when creating a probe point.

Signed-off-by: Jyri Sarha <jyri.sarha@linux.intel.com>

Author: Jyri Sarha

sound/soc/sof/sof-client-probes-ipc4.c

@@ -8,6 +8,7 @@
 #include <sound/soc.h>
 #include <sound/sof/ipc4/header.h>
 #include <uapi/sound/sof/header.h>
+#include "sof-audio.h"
 #include "sof-priv.h"
 #include "ipc4-priv.h"
 #include "sof-client.h"
@@ -49,6 +50,15 @@ enum sof_ipc4_probe_type {
 	SOF_IPC4_PROBE_TYPE_INTERNAL
 };
 
+#define SOF_IPC4_PROBE_TYPE_SHIFT		24
+#define SOF_IPC4_PROBE_TYPE_MASK		GENMASK(25, 24)
+#define SOF_IPC4_PROBE_TYPE_GET(x)		(((x) & SOF_IPC4_PROBE_TYPE_MASK) \
+						 >> SOF_IPC4_PROBE_TYPE_SHIFT)
+#define SOF_IPC4_PROBE_IDX_SHIFT		26
+#define SOF_IPC4_PROBE_IDX_MASK			GENMASK(31, 26)
+#define SOF_IPC4_PROBE_IDX_GET(x)		(((x) & SOF_IPC4_PROBE_IDX_MASK) \
+						 >> SOF_IPC4_PROBE_IDX_SHIFT)
+
 struct sof_ipc4_probe_point {
 	u32 point_id;
 	u32 purpose;
@@ -62,6 +72,20 @@ struct sof_ipc4_probe_info {
 
 #define INVALID_PIPELINE_ID      0xFF
 
+static const char *sof_probe_ipc4_type_string(u32 type)
+{
+	switch (type) {
+	case SOF_IPC4_PROBE_TYPE_INPUT:
+		return "input";
+	case SOF_IPC4_PROBE_TYPE_OUTPUT:
+		return "output";
+	case SOF_IPC4_PROBE_TYPE_INTERNAL:
+		return "internal";
+	default:
+		return "UNKNOWN";
+	}
+}
+
 /**
  * sof_ipc4_probe_get_module_info - Get IPC4 module info for probe module
  * @cdev:		SOF client device
@@ -224,6 +248,38 @@ static int ipc4_probes_points_info(struct sof_client_dev *cdev,
 	return 0;
 }
 
+/**
+ * ipc4_probes_point_print - Human readable print of probe point descriptor
+ * @cdev:	SOF client device
+ * @buf:	Buffer to print to
+ * @size:	Available bytes in buffer
+ * @desc:	Describes the probe point to print
+ * @return:	Number of bytes printed or an error code (snprintf return value)
+ */
+static int ipc4_probes_point_print(struct sof_client_dev *cdev, char *buf, size_t size,
+				   struct sof_probe_point_desc *desc)
+{
+	struct device *dev = &cdev->auxdev.dev;
+	struct snd_sof_widget *swidget;
+	int ret;
+
+	swidget = sof_client_ipc4_find_swidget_by_id(cdev, SOF_IPC4_MOD_ID_GET(desc->buffer_id),
+						     SOF_IPC4_MOD_INSTANCE_GET(desc->buffer_id));
+	if (!swidget)
+		dev_err(dev, "%s: Failed to find widget for module %lu.%lu\n",
+			__func__, SOF_IPC4_MOD_ID_GET(desc->buffer_id),
+			SOF_IPC4_MOD_INSTANCE_GET(desc->buffer_id));
+
+	ret = snprintf(buf, size, "%#x,%#x,%#x\t%s %s buf idx %lu %s\n",
+		       desc->buffer_id, desc->purpose, desc->stream_tag,
+		       swidget ? swidget->widget->name : "<unknown>",
+		       sof_probe_ipc4_type_string(SOF_IPC4_PROBE_TYPE_GET(desc->buffer_id)),
+		       SOF_IPC4_PROBE_IDX_GET(desc->buffer_id),
+		       desc->stream_tag ? "(connected)" : "");
+
+	return ret;
+}
+
 /**
  * ipc4_probes_points_add - connect specified probes
  * @cdev:	SOF client device
@@ -328,6 +384,7 @@ const struct sof_probes_ipc_ops ipc4_probe_ops =  {
 	.init = ipc4_probes_init,
 	.deinit = ipc4_probes_deinit,
 	.points_info = ipc4_probes_points_info,
+	.point_print = ipc4_probes_point_print,
 	.points_add = ipc4_probes_points_add,
 	.points_remove = ipc4_probes_points_remove,
 };

sound/soc/sof/sof-client-probes.c

@@ -17,8 +17,14 @@
 
 #include <sound/soc.h>
 #include <sound/sof/header.h>
+#include <sound/sof/ipc4/header.h>
 #include "sof-client.h"
 #include "sof-client-probes.h"
+#include "sof-audio.h"
+
+#ifdef CONFIG_SND_SOC_SOF_IPC4
+#include "ipc4-priv.h"
+#endif
 
 #define SOF_PROBES_SUSPEND_DELAY_MS 3000
 /* only extraction supported for now */
@@ -223,9 +229,13 @@ static ssize_t sof_probes_dfs_points_read(struct file *file, char __user *to,
 	for (i = 0; i < num_desc; i++) {
 		offset = strlen(buf);
 		remaining = PAGE_SIZE - offset;
-		ret = snprintf(buf + offset, remaining,
-			       "Id: %#010x  Purpose: %u  Node id: %#x\n",
-				desc[i].buffer_id, desc[i].purpose, desc[i].stream_tag);
+		if (ipc->point_print)
+			ret = ipc->point_print(cdev, buf + offset, remaining, &desc[i]);
+		else
+			ret = snprintf(buf + offset, remaining,
+				       "Id: %#010x  Purpose: %u  Node id: %#x\n",
+				       desc[i].buffer_id, desc[i].purpose, desc[i].stream_tag);
+
 		if (ret < 0 || ret >= remaining) {
 			/* truncate the output buffer at the last full line */
 			buf[offset] = '\0';

sound/soc/sof/sof-client-probes.h

@@ -41,6 +41,8 @@ struct sof_probes_ipc_ops {
 	int (*points_info)(struct sof_client_dev *cdev,
 			   struct sof_probe_point_desc **desc,
 			   size_t *num_desc);
+	int (*point_print)(struct sof_client_dev *cdev, char *buf, size_t size,
+			   struct sof_probe_point_desc *desc);
 	int (*points_add)(struct sof_client_dev *cdev,
 			  struct sof_probe_point_desc *desc,
 			  size_t num_desc);